Texas Instruments Corporation

Somasunder Kattepura Sreenath

Sumantra Seth

Sujoy Chakravarty

Gururaj Reddy Kulkarni

Jayawardan Janardhanan

Gopalkrishna Nayak

Vikas Kumar Sinha

Abhijith Arakali

Shivaprakash Halagur

Arakali Abhijith

Chandan Muddamsetty

Pradeep Kumar Ubbala

Systems and methods for a universal Serializer-Deserializer (SerDes) architecture are described. In various implementations, a transceiver may include: a first plurality of data flip-flops coupled to a data lookup circuit of a SerDes interface; a second plurality of data flip-flops coupled to the data lookup circuit; a plurality of latches, each latch of the plurality of latches coupled to a corresponding data flip-flop of the second plurality of data flip-flops; and a plurality of multiplexers coupled to the plurality of latches, to the first plurality of data flip-flops, and to a transmitter circuit.

Universal serializer architecture

Architecture for VBUS pulsing in an Ultra Deep Sub Micron (UDSM) process for ensuring USB-OTG (On The Go) session request protocol, the architecture being of the type wherein at least a charging circuit is deployed, uses a diode-means connected in a forward path of the charging circuit. The architecture might include a diode-divider including nodes and connected from VBUS in said charging circuit. One embodiment uses both charging and discharging circuits comprising transistors. The charging circuit transistor might comprise a PMOS transistor and the discharging circuit transistor might comprise a NMOS transistor. The architecture might include a three resistance string of a total resistance value approximating 100K Ohms connected between said VBUS and ground, wherein the discharging circuit transistor might comprise a drain extended NMOS transistor. The charging and discharging circuit transistors have VDS and VGD of about 3.6V, whereby high VGS transistors are not needed.

Architecture for VBUS pulsing in UDSM processes

A synchronous circuit for clock multiplexing and output-enable is implemented using a pair of logic gates and an output block. Select signals and enable signals with the corresponding logic sense are provided as inputs to the pair of logic gates, which generate respective logic outputs. The output block contains synchronizers clocked by respective input signals, and receives the logic outputs also as inputs. The output block provides a selected one of the input signals as an output, the provision of the selected input signal being accomplished in a synchronous fashion. Enabling and disabling of the output are also performed synchronously.

Synchronous clock multiplexing and output-enable

A biasing circuit is presented. The biasing circuit includes a primary biasing circuit, a replica circuit and an amplifier. The primary circuit provides a biasing voltage and a primary voltage. The biasing voltage is the output of the biasing circuit. The replica biasing circuit provides a replica voltage. The replica biasing circuit includes a first resistive element said first resistive element having a resistive characteristics; a first current source said first current source having the first resistive element for generating a current as a function of the first resistive element; a first node to couple to receive the first current source to generate the replica voltage at the first node; a second current source; a second node to coupled to receive the second current source, and a second resistive element coupled between the first noted and the second node, said second resistive element having substantially similar resistive characteristics to that of the first resistive element. The amplifier having a first input terminal to couple to receive the primary voltage from the primary biasing circuit, a second input terminal to couple to receive the replica voltage from the replica biasing circuit, and an output terminal to couple to the primary biasing circuit to adaptively adjust a current through the primary biasing circuit according to the received voltages. Further, a current mirror circuit is provided having the biasing circuit.

Constant margin CMOS biasing circuit

A gate leakage insensitive current mirror circuit including an input stage, an output stage, and a pair of complementary source followers. The pair of complementary source followers is connected between the input stage and the output stage. In operation, the input stage receives an input current and the pair of complementary source followers receives a first current source and a second current source. The output stage then provides an output current. The complementary source followers form a negative feedback loop and establish a bias voltage for the input stage and the output stage as a function of the input current that is independent of gate leakage between the input stage and the output stage.

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Bengaluru, India

Somasunder Kattepura Sreenath